PHP Merge (Add) Two Arrays by Same Key -

i have 2 arrays.

$a = array('a' => 2, 'b' => 5, 'c' => 8); $b = array('a' => 3, 'b' => 7, 'c' => 10); 

i want merge these 2 arrays , following result.

$c = array('a' => 5, 'b' => 12, 'c' => 18); 

what easiest way archive this?

thanks!

as mentioned in comments, looping through array trick.

$a = array('a' => 2, 'b' => 5, 'c' => 8); $b = array('a' => 3, 'b' => 7, 'c' => 10); $c = array(); foreach($a $index => $item) {   if(isset($b[$index])) {     $new_value = $a[$index] + $b[$index];     $c[$index] = $new_value;   } }